Feature

• key-value pairs
• Unordered
• Mutable
• Iterable

Create a dictionary

• {}

desserts = {'Muffin':39, 'Scone':25, 'Biscuit':20}

• dict()

afternoon_tea = [['Muffin', 39], ['Scone', 25], ['Biscuit', 20]]
desserts = dict(afternoon_tea)
print(desserts) #{'Muffin':39, 'Scone':25, 'Biscuit':20}

number = ('a1', 'b2', 'c3', 'd4')
dict(number)
print(number) #{'a': '1', 'b': '2', 'c': '3', 'd': '4'}

desserts = dict(Muffin=39, Scone=25, Biscuit=20)
print(desserts) #{'Muffin':39, 'Scone':25, 'Biscuit':20}

Functions

• get value

fridge = {'almond': 5, 'apple': 2, 'avocado': 10}
print(fridge['avocado']) #10
print(fridge.get('apple')) #2

• setdefault()

to_buy = {'apple':3, 'almond':5}
print(to_buy.setdefault('apple', 1)) #3
print(to_buy.setdefault('acavodo', 10)) #10
print(to_buy) #{'apple': 3, 'almond': 5, 'acavodo': 10}

• keys()

• values()

• items()

  afternoon_tea = {'Muffin': 39, 'Scone': 25, 'Biscuit': 20}
  print(afternoon_tea.keys()) #dict_keys(['Muffin', 'Scone', 'Biscuit'])
  print(afternoon_tea.values()) #dict_values([39, 25, 20])
  print(afternoon_tea.items()) #dict_items([('Muffin', 39), ('Scone', 25), ('Biscuit', 20)])
  

• in / not in

print('Muffin' in afternoon_tea) #True
print('Scone' not in afternoon_tea) #False